Which role is played by lactic acid bacteria (LAB) in our stomach?

Options

A. Beneficial
B. Harmful
C. Neutral
D. All of these

Answer

### Step-by-Step Solution:

1. **Understanding Lactic Acid Bacteria (LAB)**:
- Lactic Acid Bacteria are a group of beneficial bacteria that play a crucial role in the fermentation process. They are commonly found in fermented foods like yogurt, cheese, and pickles.

2. **Inoculation in Milk**:
- When LAB is introduced to milk, it acts as an inoculum. This means that LAB initiates the fermentation process that converts milk into curd.

3. **Fermentation Process**:
- During fermentation, LAB partially breaks down lactose (the sugar present in milk) into lactic acid. This process not only thickens the milk but also gives it a tangy flavor.

4. **Role of Lactic Acid**:
- The lactic acid produced during fermentation has several benefits. One of the primary roles of lactic acid in the stomach is its ability to create an acidic environment.

5. **Killing Harmful Bacteria**:
- The acidic environment created by lactic acid helps to inhibit the growth of harmful bacteria in the stomach. This is crucial for maintaining gut health and preventing infections.

6. **Conclusion**:
- Therefore, Lactic Acid Bacteria play a beneficial role in our stomach by producing lactic acid, which helps kill harmful bacteria and supports a healthy digestive system.